                           {1 "1"
                            2 "1"
                            3 "1"}
-                          {1 ["sup1" 3]
-                           2 ["sup1" 3]
-                           3 ["sup2" 2]
+                          {[1] ["sup1" 3]
+                           [2] ["sup1" 3]
+                           [3] ["sup2" 2]
                            })
                         (advance-cluster-time cluster 2)
                         (heartbeat-workers cluster "sup1" [3])

                           2 "1"
                           3 "1"
                           4 "1"}
                          {1 ["sup1" 1]
                           2 ["sup1" 2]
                           3 ["sup2" 1]
                           4 ["sup2" 1]
                           })
                        (advance-cluster-time cluster 2)
                        (heartbeat-workers cluster "sup1" [1 2])

                           2 "1"
                           3 "1"
                           4 "1"}
                          {[1] ["sup1" 1]
                           [2] ["sup1" 2]
                           [3] ["sup1" 3]
                           [4] ["sup1" 3]
                           })
                        (advance-cluster-time cluster 2)
                        (heartbeat-workers cluster "sup1" [1 2 3])
